Energy dependent ratios of level-density parameters in superheavy nuclei

Rahmatinejad, A.; Shneidman, T. M.; Adamian, G. G.; Antonenko, N. V.; Jachimowicz, P.; Kowal, M.

doi:10.1103/physrevc.105.044328

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…Initially, based on FGM calculations, it predicted that the NLDP would be purely a mass-dependent and energy-independent parameter. But, using experimental data of low-lying levels, it was shown that this parameter can be affected by many structural effects such as angular momentum [31][32][33], nuclear shell structure [34,35], deformation and collective enhancement [36][37][38][39][40][41], isospin [42][43][44][45] and can be even a function of excitation energy [46][47][48][49]. Therefore, many attempts were made to provide an effective relationship regarding the energy-dependent parameter [50][51][52][53].…”

Section: Introductionmentioning

confidence: 99%

Evidence on the high energy behavior of nuclear level density parameter

Sepiani,

Nasrabadi

2023

Phys. Scr.

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The nuclear level density parameter (NLDP) plays an important and crucial role in the most widely used phenomenological models that calculate the nuclear level density (NLD) based on the Fermi gas model (FGM). NLDP can be affected by various effects that have been ignored during the FGM calculations. The dependence of NLDP on excitation energy has been predicted by various references and using various relationships that are mainly tested and normalized at low energies by experimental data of low levels. In this research, using nuclear reaction codes and experimental data of the evaporation spectrum of heavy ion 32S + 74Ge reaction leading to 106Cd compound nucleus (CN) at high excitation energies, high energy behaviour of NLDP is investigated and compared with different relationship predictions. By calculating and reducing the contribution of non-equilibrium mechanisms, it is suggested that NLDP behaves increasing and then decreasing at high energies (almost Gaussian-like behavior), contrary to the predictions of all conventional energy-dependent NLDP relations.

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Section: Introductionmentioning

confidence: 99%

Evidence on the high energy behavior of nuclear level density parameter

Sepiani,

Nasrabadi

2023

Phys. Scr.

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“…Several methods for calculating NLD are usually based on two approaches: combinatorial and thermodynamic [22][23][24][25]. In this paper, the statistical formalism based on the superfluidity model [14,[26][27][28][29][30][31] is used to calculate the NLD of nuclei formed after the emission of a neutron, a proton, and an α-particle. This method consistently considers pairing and shell effects when estimating the probabilities of xn-and pxn or αxn-evaporation channels.…”

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confidence: 99%

Level-density parameters in superheavy nuclei

Rahmatinejad

Bezbakh

Shneidman³

et al. 2021

Phys. Rev. C

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The probabilities of xn-, pxn-, and αxn-evaporation channels in excited superheavy nuclei were evaluated using the Monte Carlo method. The calculations utilized microscopically determined nuclear level densities and were compared with results obtained from the phenomenological Jackson formula. Effective temperatures derived from the microscopic approach were incorporated into the Jackson formula for different evaporation channels at low and moderate excitation energies.Additionally, an analytical formula was introduced to estimate the average kinetic energy of emitted particles in multi-step processes.

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